Thermoplastic elastomer composition, laminate structure and method for producing said laminate structure

Abstract

A thermoplastic elastomer composition including an acrylic block copolymer (I) and a hydrogenated block copolymer (II). The content of the acrylic block copolymer (I) is 70 to 300 parts by mass with respect to 100 parts by mass of the hydrogenated block copolymer (II); the hydrogenated block copolymer (II) is a hydrogenated product of a block copolymer (P) including a polymer block (A1) containing structural units derived from an aromatic vinyl compound, and a polymer block (B1) containing 1 to 100 mass % of structural units (b1) derived from farnesene and 99 to 0 mass % of structural units (b2) derived from a conjugated diene other than farnesene, the mass ratio [(A1)/(B1)] of the polymer block (A1) to the polymer block (B1) being 1/99 to 70/30; and the hydrogenation ratio of carbon-carbon double bonds in the polymer block (B1) is 50 to 100 mol %.

The invention claimed is: 
     
       1. A thermoplastic elastomer composition comprising an acrylic block copolymer (I) and a hydrogenated block copolymer (II), wherein
 the content of the acrylic block copolymer (I) is 70 to 300 parts by mass with respect to 100 parts by mass of the hydrogenated block copolymer (II), 
 the hydrogenated block copolymer (II) is a hydrogenated product of a block copolymer (P) including
 at least two polymer blocks (A1) containing structural units derived from an aromatic vinyl compound, 
 a polymer block (B1) containing 1 to 100 mass % of structural units (b1) derived from farnesene and 99 to greater than 0 mass % of structural units (b2) derived from a conjugated diene other than farnesene, and 
 a polymer block (C1) containing less than 1 mass % of structural units (c1) derived from farnesene, and 1 to 100 mass % of structural units (c2) derived from a conjugated diene other than farnesene, wherein 
 
 the block copolymer (P) includes at least one polymer block (B1) located at a terminal, and the hydrogenation ratio of carbon-carbon double bonds in the polymer block (B1) and the polymer block (C1) is 50 to 100 mol %, 
 the mass ratio [(A1)/((B1)+ (C1))] of the polymer blocks (A1) to the total of the polymer block (B1) and the polymer block (C1) is 1/99 to 70/30, 
 the mass ratio [(A1)/(B1)] of the polymer block (A1) to the polymer block (B1) is 1/99 to 70/30, and 
 the hydrogenation ratio of carbon-carbon double bonds in the polymer block (B1) is 50 to 100 mol %. 
 
     
     
       2. The thermoplastic elastomer composition according to  claim 1 , wherein the acrylic block copolymer (I) includes a polymer block (D1) containing structural units derived from an acrylic acid ester, and a polymer block (E1) containing structural units derived from a methacrylic acid ester, and the acrylic block copolymer (I) is a triblock copolymer having blocks in the order of the polymer block (E1), the polymer block (D1) and the polymer block (E1). 
     
     
       3. The thermoplastic elastomer composition according to  claim 1 , wherein the molecular weight distribution of the acrylic block copolymer (I) is in the range of 1.00 to 1.40. 
     
     
       4. The thermoplastic elastomer composition according to  claim 1 , further comprising 1 to 200 parts by mass of a softener (IV) with respect to 100 parts by mass of the hydrogenated block copolymer (II). 
     
     
       5. The thermoplastic elastomer composition according to  claim 1 , wherein the hydrogenation ratio of carbon-carbon double bonds in the polymer block (B1) is 70 to 100 mol %. 
     
     
       6. The thermoplastic elastomer composition according to  claim 1 , wherein the aromatic vinyl compound is at least one selected from the group consisting of styrene, α-methylstyrene and 4-methylstyrene. 
     
     
       7. The thermoplastic elastomer composition according to  claim 1 , wherein the farnesene is β-farnesene. 
     
     
       8. The thermoplastic elastomer composition according to  claim 1 , wherein the conjugated diene other than farnesene is at least one selected from the group consisting of isoprene, butadiene and myrcene. 
     
     
       9. The thermoplastic elastomer composition according to  claim 1 , wherein the acrylic block copolymer (I) has a peak-top molecular weight (Mp) in the range of 50,000 to 250,000 as measured by gel permeation chromatography relative to standard polystyrene. 
     
     
       10. The thermoplastic elastomer composition according to  claim 1 , wherein the hydrogenated block copolymer (II) has a peak-top molecular weight (Mp) of 4,000 to 1,500,000 as measured by gel permeation chromatography relative to standard polystyrene. 
     
     
       11. The thermoplastic elastomer composition according to  claim 1 , wherein the hydrogenated block copolymer (II) is a hydrogenated product of a triblock copolymer having blocks in the order of the polymer block (A1), the polymer block (B1) and the polymer block (A1). 
     
     
       12. The thermoplastic elastomer composition according to  claim 1 , further comprising 1 to 200 parts by mass of a polar group-containing polymer (III) with respect to 100 parts by mass of the hydrogenated block copolymer (II). 
     
     
       13. The thermoplastic elastomer composition according to  claim 12 , wherein the polar group-containing polymer (III) is a hydrophilic group-containing block copolymer having a structure in which polyolefin blocks and hydrophilic polymer blocks are bonded to one another alternately. 
     
     
       14. A laminate structure comprising a layer formed of the thermoplastic elastomer composition according to  claim 1 , and a layer formed of a further material other than the thermoplastic elastomer composition. 
     
     
       15. The laminate structure according to  claim 14 , wherein the further material is at least one selected from the group consisting of synthetic resins, metals and ceramics. 
     
     
       16. A method for producing a laminate structure, the method comprising thermally laminating a layer formed of the thermoplastic elastomer composition according to  claim 1  onto a layer formed of a further material other than the thermoplastic elastomer composition.